Calculation of farfield distortion for a tilted-facet SOA

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Semiconductor optical amplifiers (SOAs) are very important elements for telecommunications, computer communications, and signal processing applications. For stable, low noise operation, the modal reflection into the guided SOA mode must be minimized; modal reflectivity typically has to be kept below about {minus}40 dB. This can be accomplished by antireflection (AR) coatings, or by tilting of the SOA end facet. The latter approach has been vigorously pursued recently, because effective AR coatings require very high tolerances and have polarization-dependent reflectivities. Consequently, there has been a great deal of theoretical effort aimed at calculating the modal reflectivity from tilted interfaces, using a ... continued below

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6 p.

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Ratowsky, R.P.; Dijaili, S.; Walker, J.; Patterson, F.; Kallman, J. & Deri, R. April 1, 1996.

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Description

Semiconductor optical amplifiers (SOAs) are very important elements for telecommunications, computer communications, and signal processing applications. For stable, low noise operation, the modal reflection into the guided SOA mode must be minimized; modal reflectivity typically has to be kept below about {minus}40 dB. This can be accomplished by antireflection (AR) coatings, or by tilting of the SOA end facet. The latter approach has been vigorously pursued recently, because effective AR coatings require very high tolerances and have polarization-dependent reflectivities. Consequently, there has been a great deal of theoretical effort aimed at calculating the modal reflectivity from tilted interfaces, using a variety of approaches. However, there has been little attention directed toward calculating the transmitted field of a tilted-facet SOA. This is a problem of considerable importance, because the coupling of the SOA light to an element such as an optical fiber depends critically on the field distribution at the entrance plane to the fiber. Moreover, experimental measurements of the farfield of tilted-facet SOAs have revealed a curious crescent-shaped intensity distribution. To improve coupling efficiency it is important to understand to what extent this phenomenon is due to the SOA modal field distribution and to what extent it is due to the tilted interface. The authors explain the crescent-shaped farfield intensity distribution of tilted-facet SOAs using vector wave optics, and discuss implications for coupling to other optical elements.

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6 p.

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OSTI as DE96010370

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  • Optical Society of America (OSA) meeting on integrated photonics research, Boston, MA (United States), 29 Apr - 3 May 1996

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  • Other: DE96010370
  • Report No.: UCRL-JC--123348
  • Report No.: CONF-960493--11
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 251355
  • Archival Resource Key: ark:/67531/metadc668326

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  • April 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 18, 2016, 11:49 a.m.

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Ratowsky, R.P.; Dijaili, S.; Walker, J.; Patterson, F.; Kallman, J. & Deri, R. Calculation of farfield distortion for a tilted-facet SOA, article, April 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc668326/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.